diff options
| author | dillon min <dillon.minfei@gmail.com> | 2020-09-03 09:30:22 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bgolaszewski@baylibre.com> | 2020-09-09 11:33:07 +0200 |
| commit | d284c16f84c9f8facdde25c9c077cfdcb66163d5 (patch) | |
| tree | 7ddc7b42171604f52ce2f81ab65ffc95cff8fd60 /drivers/gpio/gpio-tc3589x.c | |
| parent | gpio: zynq: Simplify with dev_err_probe() (diff) | |
| download | linux-d284c16f84c9f8facdde25c9c077cfdcb66163d5.tar.xz linux-d284c16f84c9f8facdde25c9c077cfdcb66163d5.zip | |
gpio: tc35894: Disable Direct KBD interrupts to enable gpio irq
On tc35894, have to disable direct keypad interrupts to make
it as general purpose interrupts functionality work.
if not, after chip reset, IRQST(0x91) will always 0x20,
IRQN always low level, can't be clear.
Configure DIRECTx to enable general purpose gpio mode,
else read GPIOMISx register always zero in irq routine.
verified on tc35894, need more test on other tc3589x.
Signed-off-by: dillon min <dillon.minfei@gmail.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Diffstat (limited to 'drivers/gpio/gpio-tc3589x.c')
| -rw-r--r-- | drivers/gpio/gpio-tc3589x.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c index 58b0da9eb76f..79d285b845dc 100644 --- a/drivers/gpio/gpio-tc3589x.c +++ b/drivers/gpio/gpio-tc3589x.c @@ -19,9 +19,9 @@ * These registers are modified under the irq bus lock and cached to avoid * unnecessary writes in bus_sync_unlock. */ -enum { REG_IBE, REG_IEV, REG_IS, REG_IE }; +enum { REG_IBE, REG_IEV, REG_IS, REG_IE, REG_DIRECT }; -#define CACHE_NR_REGS 4 +#define CACHE_NR_REGS 5 #define CACHE_NR_BANKS 3 struct tc3589x_gpio { @@ -200,6 +200,7 @@ static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d) [REG_IEV] = TC3589x_GPIOIEV0, [REG_IS] = TC3589x_GPIOIS0, [REG_IE] = TC3589x_GPIOIE0, + [REG_DIRECT] = TC3589x_DIRECT0, }; int i, j; @@ -228,6 +229,7 @@ static void tc3589x_gpio_irq_mask(struct irq_data *d) int mask = BIT(offset % 8); tc3589x_gpio->regs[REG_IE][regoffset] &= ~mask; + tc3589x_gpio->regs[REG_DIRECT][regoffset] |= mask; } static void tc3589x_gpio_irq_unmask(struct irq_data *d) @@ -239,6 +241,7 @@ static void tc3589x_gpio_irq_unmask(struct irq_data *d) int mask = BIT(offset % 8); tc3589x_gpio->regs[REG_IE][regoffset] |= mask; + tc3589x_gpio->regs[REG_DIRECT][regoffset] &= ~mask; } static struct irq_chip tc3589x_gpio_irq_chip = { @@ -334,6 +337,17 @@ static int tc3589x_gpio_probe(struct platform_device *pdev) if (ret < 0) return ret; + /* For tc35894, have to disable Direct KBD interrupts, + * else IRQST will always be 0x20, IRQN low level, can't + * clear the irq status. + * TODO: need more test on other tc3589x chip. + * + */ + ret = tc3589x_reg_write(tc3589x, TC3589x_DKBDMSK, + TC3589x_DKBDMSK_ELINT | TC3589x_DKBDMSK_EINT); + if (ret < 0) + return ret; + ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, tc3589x_gpio_irq, IRQF_ONESHOT, "tc3589x-gpio", |